Boring-tool holder.



K. M. FRITTS.

BORING TOOL HOLDER. APPLICATION FILED AUG.31, 19m.

1 ,fi'm. y 1 5%, Patented July 2, 1918.

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Tlhl ens KENNETH 1W. FRITTS, F MILLCBEEK TO'WNSHTP, ERIE COUNTY, PENNSYLVANIA;

BORING-TOOL HOLDER.

Application filedl- August 31, 1916.

Tool Holders, of which the following is a specification.

This invention relates to boring tool holders and consists in certain improvements in the construction thereof as will be hereinafter fully described and pointed out in the claims.

The object of the invention is to provide an easily and nicely adjustable tool holder suitable for boring tools.

The invention is illustrated in the accompanying drawings as follows Figure 1 shows a plan view of the tool holder.

Fig. 2 a rear view of the tool holding slide.

Fig, 3 a side view of the tool holding slide. I

Fig. i a face view of the adjusting ring.

Fig. 5 a side elevation of the adjusting ring.

Fig. 6 an elevation of the spring operating on the adjusting ring.

Fig. 7 a fragmentary section, showing the means for locking the adjusting ring on the head.

Fig. 8 a central section on the line 88 in Fig. 1.

Fig. 9 a side elevation of an alternative construction of a tool holding slide.

1 marks the shank and 2 the tool holding head. A guide-way 3 is arranged on the face of the head, this guide-way having a slot through it, the edges of which have the over-hanging lips 4t and the grooves 5.

A slide 6 is arranged in the slot in the guide-way, the slide having the ears or projections 7 extending into the grooves 5.

The slide has the tool-holding socket 8 in which a boring tool as A may be placed and a set screw 9 is provided by means of which the tool may be locked in position.

The slide has the threads 10 on its rear surface. These threads formed in arcs of circles of equal radii.

An adjusting ring 11 is rotatively mounted on the head 2, the head having a bearing 13 for receiving the ring, the bearing terminating in a shoulder 14 against which the head rests. The ring has a scroll face 11, the threads of the scroll engaging the Specification of Letters Patent.

are preferably Patented July 2, 1%18.

Serial No. 117,870.

threads 10 of the slide. The middle thread of the scroll is preferably of approximately the same curve or are as the threads 10 and the other threads each side of this approximating so that there is a comparatively'close fit between the threads of the scroll and the threads 10 of the slide. The ring 11 has the groove 12 in which is arranged a spring 15. This spring is simply a bow spring and has, a hook end 16 which extends into a socket 17 in the face of the shoulder 14:.

The spring presses the ring 11 so as to hold the scroll 11 in close engagement with the threads 10 so that there is no slack and consequently a very nice adjustment may be had of the tool. The threads as shown have beveled faces so that as the spring presses the threads into engagement some of the surfaces are in close contact so as to prevent movement of the slide transversely of the axis of the tool.

At the opposite side of the ring from that engaging the threads it is desirable to lock the ring against outward movement on the head. For this purpose the ring is pro vided with an annular groove 18 on its inner surface. The head is provided with a socket 19 in which is arranged a ball T 20. The ball T 20 is forced out into the groove by means of a set screw 21. The ball per mits the turning of the ring but looks it against removal from the head.

The ring preferably has graduations 22 operating in connection with the marks 23 on the head, thus making a micrometer adjustment by means of which the adjustment of the tool may be very accurately gaged. The ring is also preferably knurled at 24 so that it may be more readily grasped by the operator and a screw 25 is provided in the guide-way by means of which the slide may be locked in adjustment if desired.

In Fig. 9 T have shown an alternative construction of tool holder. In this the slide 27 has the ears 28 which operate in the grooves 5. The threads 29 operate on the adjusting ring in the manner of the threads 10. The tool holding socket 30, shown in dotted lines, is at an angle to the axis instead of parallel with it as in the preferred construction. This permits of a wider sweep of the tool so as to adapt the tool holder to work of larger diameters than that of the preferred construction,

What I claim new is 1. In a boring tool holder, the combination of a head having a guide-Way extending transversely of the axis of the head; a slide carried by the guide-Way, said slide having curved threads on its rear surface and having means thereon for securing a boring tool; and an adjusting ring rotatively mounted on the head and having scroll threads on its front face engaging the threads on the slide.

2. In a boring tool holder, the combination of a head having a guide-Way extending transversely across its axis and across its face; a slide carried by the guide-Way, said slide extending across the axis and having curved threads on its rear surface and means thereon for securing a boring tool; and an adjusting ring rotatively mounted on the head and having scroll threads on its front face engaging the threads on the slide.

3. In a boring tool holder, the combination of a head having a guide-Way extending transversely of the axis of the head; a slide carried by the guide-Way, said slide having curved threads on its rear surface and having means thereon for securing a boring tool; an adjusting ring rotatably mounted on the head and having scroll threads on its face engaging the threads on the slide, said threads having beveled engaging surfaces; and a spring holding the adjusting ring in spring-pressed engagement with the slide.

4. In a boringtool holder, the combination of a head having a guide-Way extending transversely of the axis of the head; a slide carried by the guide-Way, said slide having curved threads on its rear surface and having means thereon for securing a boring tool; an adjusting ring rotatively mounted on the head and having scroll threads on its face engaging the threads on the slide; and means for locking the ring on the head.

5. In a boring tool holder, the combination of a head having a guide-way extending transversely f the axis of the head; a slide carried by the guide-Way, said slide having curved threads on its rear surface and having means thereon for securing a boring tool; an adjusting ring rotatively mounted on the head and having scroll threads on its face engaging the threads on the slide; a spring at one side of the head holding the ring in spring-pressed engagement with the slide; and means opposite the spring for locking the ring on the head.

(3. In a boring tool holder, the combination of a head having a shoulder bearing thereon and a guide-Way on its face having an under-cut groove therein; a tool-holding slide arranged in said guide-\\'ay and ex tending across the axis, said slide having curved threads on its rear face and means for securing a boring tool thereon; an adjusting ring rotatively mounted on the bear ing on the head having scroll threads on its face engaging the threads on the slide, said ring having a spring-receiving groove therein and a-key-receiving groove on its inner surface; a spring mounted in the head and acting on the ring for holding the ring in spring-pressed engagement With the threads; and a ball-key operating in the groove in the interior of the ring for locking the ring on the head.

In testimony whereof I have hereunto set my hand.

KENNETH M. FRITTS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C." 

